#!/bin/sh
#DL_URL=http://your_remove_pkg_host.tld/packages/
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# any later version.

function gen_packages_txt {
	echo '' > PACKAGES.TXT
	find . -type f -name '*.meta' -exec cat {} \; >> PACKAGES.TXT
  cat PACKAGES.TXT | gzip -9 -c - > PACKAGES.TXT.gz
}

function gen_md5_checksums {
	echo '' > CHECKSUMS.md5
	find . -type f -regextype posix-egrep -regex '.*\.[tgblzikx]+$' -exec md5sum {} \; >> CHECKSUMS.md5
  cat CHECKSUMS.md5 | gzip -9 -c - > CHECKSUMS.md5.gz
}

function gen_meta {
	if [ ! -f $1 ]; then
		echo "File not found: $1"
		exit 1;
	fi
		if [ "`echo $1|grep -E '(.*{1,})\-(.*[\.\-].*[\.\-].*).[tgblzikx]{2,}[ ]{0,}$'`" == "" ]; then
			return;
		fi

  PKGEXT=${1##*.}
  case $PKGEXT in
	tgz) DECOMPRESS=gzip ;;
	tbz) DECOMPRESS=bzip2 ;;
	tlz) DECOMPRESS=lzma ;;
	txz) DECOMPRESS=xz ;;
  esac

	NAME=$(echo $1|sed -re "s/(.*\/)(.*.$PKGEXT)$/\2/")
	LOCATION=$(echo $1|sed -re "s/(.*)\/(.*.$PKGEXT)$/\1/")
  SIZE=$(du -bk $1 | awk '{print $1}')
	USIZE=$(expr $(cat $1 | $DECOMPRESS -dc | wc -c) / 1024)
	REQUIRED=$($DECOMPRESS -dc $1 | tar -xO install/slack-required 2>/dev/null|xargs -r -iZ echo -n "Z,"|sed -e "s/,$//")
	CONFLICTS=$($DECOMPRESS -dc $1 | tar -xO install/slack-conflicts 2>/dev/null|xargs -r -iZ echo -n "Z,"|sed -e "s/,$//")
	SUGGESTS=$($DECOMPRESS -dc $1 | tar -xO install/slack-suggests 2>/dev/null|xargs -r )
	METAFILE=${NAME%$PKGEXT}meta
	echo "PACKAGE NAME:  $NAME" > $LOCATION/$METAFILE
	if [ -n "$DL_URL" ]; then
		echo "PACKAGE MIRROR:  $DL_URL" >> $LOCATION/$METAFILE
	fi
	echo "PACKAGE LOCATION:  $LOCATION" >> $LOCATION/$METAFILE
	echo "PACKAGE SIZE (compressed):  $SIZE K" >> $LOCATION/$METAFILE
	echo "PACKAGE SIZE (uncompressed):  $USIZE K" >> $LOCATION/$METAFILE
	echo "PACKAGE REQUIRED:  $REQUIRED" >> $LOCATION/$METAFILE
	echo "PACKAGE CONFLICTS:  $CONFLICTS" >> $LOCATION/$METAFILE
	echo "PACKAGE SUGGESTS:  $SUGGESTS" >> $LOCATION/$METAFILE
	echo "PACKAGE DESCRIPTION:" >> $LOCATION/$METAFILE
	$DECOMPRESS -dc $1 | tar -xO install/slack-desc |grep -E '\w+\:'|grep -v '^#' >> $LOCATION/$METAFILE
	echo "" >> $LOCATION/$METAFILE
}

case "$1" in
	pkg)
		if [ -n "$2" ]; then
			gen_meta $(readlink -f $2)
		else
			echo "$0 [pkg [file]|all|new|PACKAGESTXT|MD5]"
		fi
	;;
	all)
		for pkg in `find . -type f -regex '.*\.[tgblzikx]+$' -print`
		do
			gen_meta $pkg
		done
		$0 PACKAGESTXT
		$0 MD5
	;;
	new)
		for pkg in `find . -type f -regex '.*\.[tgblzikx]+$' -print`
		do
			if [ ! -f ${pkg%${pkg##*.}}meta ]; then
				gen_meta $pkg
			fi
		done
	;;
	PACKAGESTXT)
		gen_packages_txt
	;;
	MD5)
		gen_md5_checksums
	;;
	*)
		echo "$0 [pkg [file]|all|new|PACKAGESTXT|MD5]"
	;;
esac
